Comment:
                            3 L and 4.5 L CH3OH  were adsorbed onto Pd(100) at 90 K. The substrate was treated by  Ar+ ion bombardment (Ep = 1 keV,  j =2 microamperes/cm2), annealing (T = 1100 K), oxidation (1E-7 mbar of O2 , T= 800 K), and short annealing (T = 1200 K). Emission angle =16 degrees.